package com.example.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.eduservice.entity.EduSubject;
import com.example.eduservice.entity.excel.SubjectData;
import com.example.eduservice.service.EduSubjectService;
import com.example.handler.GuliException;

public class SubjectExcelListener  extends AnalysisEventListener<SubjectData> {


    //SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作

    public EduSubjectService subjectService;

    public SubjectExcelListener() {
    }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //读取excel内容
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {

        if(subjectData==null){
            throw  new GuliException(20001,"文件数据为空");
        }
        //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //添加一级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if(existOneSubject==null){  //没有相同一级分类，进行添加

            existOneSubject=new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());  //一级分类名称
            subjectService.save(existOneSubject);

        }

        //获取一级分类的id值
        String pid=existOneSubject.getId();
        //添加二级分类
        //判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if(existTwoSubject==null){  //没有相同二级分类，进行添加
            existTwoSubject=new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());  //设置二级分类名称
            subjectService.save(existTwoSubject);

        }

    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){

        //构造条件
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject=subjectService.getOne(wrapper);

        return  oneSubject;

    }
    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid){

        //构造条件
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject=subjectService.getOne(wrapper);

        return  twoSubject;

    }


    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
